Aller au menu Aller au contenu
Physico chemistry of solids, thin films, biotechnologies
Applications for micro & nano- technologies, energy, health ...

> lmgp_eng_labo > LMGP_ news

Polarity effects in ZnO nanowires

Published on May 9, 2018
A+Augmenter la taille du texteA-Réduire la taille du texteImprimer le documentEnvoyer cette page par mail cet article Facebook Twitter Linked In

Polarity effects in ZnO nanowires

Polarity control in wide band gap semiconductors like GaN and ZnO is essential for their integration into a large number of electronic and optoelectronic devices [1]. Following the demonstration in Vincent Consonni's team that ZnO nanowires grown by chemical bath deposition can be of either oxygen or zinc polarity [2], we have conducted several investigations aiming at elucidating the effects of the polarity on their growth mechanisms and on their properties.

We have shown the polarity transfer from a polycrystalline ZnO seed layer into ZnO nanowires by anomalous x-ray diffraction in synchrotron, favouring a statistical analysis over 10 million of nano-objects [3].

We have also revealed that Zn-polar ZnO nanowires elongate with a larger growth rate than O-polar ZnO nanowires. A theoretical modelling of the growth process has allowed us to attribute that difference to a larger surface reaction rate constant in the case of Zn-polar ZnO nanowires than in the case of O-polar ZnO nanowires [4].

These ongoing investigations with strong fundamental and applicative interests are specifically conducted in the framework of the project ANR ROLLER (2018 – 2021) that is in collaboration with Institut Néel, Institut des Nanotechnologies de Lyon, and LGEF.

[1] J. Zuniga-Perez, V. Consonni, L. Lymperakis, X. Kong, A. Trampert, S. Fernandez-Garrido, O. Brandt, H. Renevier, S. Keller, K. Hestroffer, M.R. Wagner, J.S. Reparaz, G. Akyol, S. Rajan, S. Rennesson, T. Palacios, and G. Feuillet, « Polarity in GaN and ZnO: Theory, measurement, growth, devices », Applied Physics Reviews 3, 041303 (2016).
[2] V. Consonni, E. Sarigiannidou, E. Appert, A. Bocheux, S. Guillemin, I.C. Robin, J. Kioseoglou, and F. Robaut, « Selective Area Growth of Well-Ordered ZnO Nanowire Arrays with Controllable Polarity », ACS Nano 8, 4761-4770 (2014).
[3] S. Guillemin, R. Parize, J. Carabetta, V. Cantelli, D. Albertini, B. Gautier, G. Brémond, D.D. Fong, H. Renevier, and V. Consonni, « Quantitative and Simultaneous Analysis of the Polarity of Polycrystalline ZnO Seed Layers and Related Nanowires Grown by Wet Chemical Deposition », Nanotechnology 28, 095704 (2017).
[4] T. Cossuet, E. Appert, J.L. Thomassin, and V. Consonni, « Polarity-Dependent Growth Rates of Selective Area Grown ZnO Nanorods by Chemical Bath Deposition », Langmuir 33, 6269-6279 (2017).

A+Augmenter la taille du texteA-Réduire la taille du texteImprimer le documentEnvoyer cette page par mail cet article Facebook Twitter Linked In

Date of update May 11, 2018


Vous voyez cet encadré, car vous avez des droits d'édition sur la page
Université Grenoble Alpes